This Fish is found at Bay of Bengal. They came to river from ocean to lay eggs, during this pregnancy period a special oil is been produced in the fish, that's why it's too much tasty in this rainy monsoon.
Cooking it with mustered seed, poppy seed paste, mustard oil and green chilies. Very easy to cook and mouth watering. But there is lots of fish bones in this fish, but you have to compromise it to take the special taste.
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From @soham-pal